Use of cutting velocities for real time pore pressure and...

Details Use of cutting velocities for real time pore pressure and... Use of cutting velocities for real time pore pressure and...

2005-11-22

2005-11-22

Bui, Bryan (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Earth science

C073S152050, C073S866000, C367S038000, C702S014000, C702S016000

Reexamination Certificate

active

06968274

ABSTRACT:
Disclosed is a new method for providing accurate real time predictions of pore pressure and fracture gradient, at the rig site by determining the wave velocity from drill cuttings by a portable continuous wave technology (CWT) tool that measures drill cuttings at high resonant frequency and then using the velocity obtained in combination with the novel method of the present invention to arrive at accurate predictions for pore pressure and fracture gradient. The new technique offers real time pore pressure prediction at the rig site with small error margin that is not otherwise available using seismic, VSP, or check shot velocities in exploration.

REFERENCES:
patent: 4876512 (1989-10-01), Kroeger et al.
patent: 4981037 (1991-01-01), Holbrook et al.
patent: 5200929 (1993-04-01), Bowers
patent: 5282384 (1994-02-01), Holbrook
patent: 5285692 (1994-02-01), Steiger et al.
Holbrook, P.W. et al: “A Petrophysical-Mechanical Math Model for Real-Time Wellsite Pore Pressure/Fracture Gradient Prediction”, SPE Annual Tech Conf & Exhibition, No. 16666 Sep. 27, 1987 pp. 163-171
Nes,O.M. et al: “Rig-site and Laboratory Use of CWT Acoustic Velocity Measurements on Cuttings”, SPE Annual Tech. Conf & Exhibition, No. 36854, Oct. 22-24, 1996, pp. 349-356.

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